Consider the neutralization reaction that takes place when hydrochloric acid reacts with aqueous calcium hydroxide

Write a conversion factor that relates moles of hydrochloric to moles of calcium hydroxide for this reaction

Balanced Equation is:

2HCl + Ca(OH)2 --> 2H2O + CaCl2

So you need 1 mole of Ca(OH)2 for every mole of HCl.

2 moles HCl / 1 mole Ca(OH)2

So you need 1 mole of Ca(OH)2 for every mole of HCl.

Should be.
So you need 1 mol Ca(OH)2 for every 2 mols HCl.
The Conversion factor is ok.

To write a conversion factor that relates moles of hydrochloric acid to moles of calcium hydroxide for the neutralization reaction, we need to look at the balanced chemical equation for the reaction:

HCl (aq) + Ca(OH)2 (aq) → CaCl2 (aq) + 2H2O (l)

According to the balanced equation, 1 mole of hydrochloric acid (HCl) reacts with 1 mole of calcium hydroxide (Ca(OH)2) to produce one mole of calcium chloride (CaCl2) and 2 moles of water (H2O).

Therefore, the conversion factor is:

1 mole HCl / 1 mole Ca(OH)2

This means that, in this reaction, for every mole of hydrochloric acid, you would need 1 mole of calcium hydroxide.